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Australia’s Great Barrier Reef (or the GBR as it is known to reef aficionados) stretches for more than 2,300 kilometers (over 1,429 miles) and can be seen from outer space. This largest barrier reef...
Welcome to Moorea, a tiny, isolated island in the middle of the vast Pacific...
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Coral reefs are beautiful, vibrant ecosystems that house roughly one quarter of...
Coral reefs are some of the most endangered ecosystems on the planet that are...

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Sponges are animals that eat tiny food particles as they pump water through their bodies. They are very common on Caribbean coral reefs, and come in all shapes, sizes and colors. There is great variability in their size: some...
Many species of pink coralline algae cover a reef surface in the Southern...
Corals are sedentery animals, so how do they reproduce? One way is sexually...

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It may be the last place you’d expect to find corals—up to 6,000 m (20,000 ft) below the ocean’s surface, where the water is...

The Ocean Blog

The pink strands of this single deep-sea coral harbor a variety of marine life. Sea whips are gorgonian corals and have flexible skeletons. See more pictures of coral in our Deep-sea Corals article.
Each month, the Naked Oceans podcast invites a leading marine researcher to pick the "critter of the month" by asking: if you were a marine organism, which one would you be? This month, Dr. Nancy...
Is it lights out for corals once they have experienced a bleaching event? Not necessarily. This photo shows a coral reef near Bocas del Toro, Panama that is in the process of recovering from a mass...
These corals are dead—smothered in sediments and overgrown with algae. The reef is near Komodo Island in Indonesia. More about coral reef ecosystems can be found in our Coral Reefs featured story .
A crown-of-thorns starfish ( Acanthaster planci ) on a reef in the Marianas Islands. An “outbreak” of these coral-eating starfish can decimate a reef, and they have done great damage on Australia's...
Giant clams are one of the many wonders of coral reefs. They can grow up to five feet wide, weigh over 400 pounds, and live for 100 years! They power all that bulk by filter feeding microbes and...
Rockfish, anemones, and other invertebrates inhabit this deep-sea coral reef in Cordell Bank National Marine Sanctuary off the coast of California. Deep-sea corals provide habitat and benefits to a...
It may be the last place you’d expect to find corals—up to 6,000 m (20,000 ft) below the ocean’s surface, where the water is icy cold and the light dim or absent. Yet believe it or not, lush coral...
Visitors to the Hyperbolic Crochet Coral Reef temporary exhibit at Smithsonian’s National Museum of Natural History saw both the main installation created by to the Institute For Figuring and the...
This bluefin trevally is lucky to call Hawaii’s Maro Coral Reef, part of the Papahānaumokuākea Marine National Monument , its home. Maro is the largest reef in the Northwest Hawaiian Islands and just...
A photo taken at a reef near Bocas del Toro, Panama. The reef suffered a mass bleaching event in the summer of 2010, when water temperatures were unusually high. In this photo, healthy brown coral...
A sea lion in the Sea of Cortez observes Dr. Peter Auster as he observes reef fishes. Learn more about deep-sea coral reefs in our Deep-sea Corals article.
Compare the healthy coral on the left with the bleached coral on the right. Increased water temperatures caused the bleached coral to lose the microscopic algae that give the coral color and provide...
For the past week, the Indonesian Biodiversity Research Center (IBRC) diving class of 2012 has seen countless fish in shades of pink, blue, yellow, red, and green darting through corals and the...
When we think "Africa," we think of the "Big Five"—lions, elephants, leopards, buffalo and rhinos—that crisscross the African Savannah. Few would imagine that there could be more natural beauty on...
A marine scientist performs a genetic analysis on a sample of deep-sea coral to find out if it is a known species or one new to science. Find out how ocean scientists study deep-sea corals in our...
Welcome to Citizens of the Sea , a new blog series where ocean life comes to life. Our book by the same name came out in September, but no sooner had it gone off to the printer than new ocean stories...
Coral reefs are beautiful, vibrant ecosystems that house roughly one quarter of all marine species and provide billions of dollars in products and services to humans each year. But they are also...
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